From Elasticsearch or CSS

If the source link of a job is a link described in Elasticsearch Link Parameters or CSS Link Parameters, configure the source job parameters based on Table 1.

**Table 1** Job parameters when Elasticsearch or CSS is the source
Category	Parameter	Description	Example Value
Basic parameters	Index	Elasticsearch index, which is similar to the name of a relational database. The index name can contain only lowercase letters.	index
Basic parameters	Type	Elasticsearch type, which is similar to the table name of a relational database. The type name can contain only lowercase letters. NOTE: Elasticsearch 7.x and later versions do not support custom types. Instead, only the _doc type can be used. In this case, this parameter does not take effect even if it is set.	_doc
Advanced attributes	Split Nested Field	(Optional) Whether to split the JSON content of the nested fields. For example, a:{ b:{ c:1, d:{ e:2, f:3 } } } can be split into a.b.c, a.b.d.e, and a.b.d.f.	No
	Filter Conditions	(Optional) CDM migrates only the data that meets the filter conditions. Currently, only the query string (q syntax) of Elasticsearch can be used to filter source data. The q syntax is used in the following way: In exact match, the **column:data format is used to match and filter data. column indicates the field name, and data indicates the query condition, for example, last_name:Smith. In addition, if data is a string containing spaces, it must be enclosed in double quotation marks. If column is not specified, all fields will be matched by data. Multiple query conditions can be combined with connection words. The format is column1:data1 AND column2:data2. The connection words can be AND, OR, or NOT. They must be in uppercase, and there must be a space before and after each connection word. Example: first_name:Alec AND last_name:John In range matching, you can directly use a condition expression to filter data. The expression is in column:>data format. The operator can be >, >=, <, or <=. An example is time:>=1636905600000 AND time:<1637078400000. It can also be used together with a macro variable of date and time, for example, createTime:>=${timestamp(dateformat(yyyyMMdd,-1,DAY))} AND createTime:< ${timestamp(dateformat(yyyyMMdd))}. In range matching, you can also use the range syntax to filter data. The format is column:{data1 TO data2*}. { and } indicate that a value is not included. [ and ] indicate that a value is included. TO must be capitalized, and there must be a space before and after it. indicates all data. For example, *time:{1636992000000 TO ] filters out all the data greater than 1636992000000 in the time field. It can also be used together with a macro variable of date and time, for example, createTime:[${timestamp(dateformat(yyyyMMdd,-1,DAY))} TO ${timestamp(dateformat(yyyyMMdd))}}**. Source data cannot be filtered using the query domain-specific language (DSL) of Elasticsearch.	last_name:Smith
	Extract Meta-field	Whether to extract index meta-fields. For example, _index, _type, _id, and _score.	Yes
	Page size	Elasticsearch page size	1000
	ScrollId Time Out	During a scroll query using Elasticsearch, a scroll_id is recorded. When the query times out or is complete, the recorded srcoll_id will be cleared. You can set this parameter to specify the timeout duration.	5